Tank Level Accuracy
Tank Level Accuracy
The accuracy of two-wire holding tank monitoring systems is greatly affected by dirty tanks, unusual mineral content in the water, or improper holding tank probe location. If the tank readings are higher than the actual level of the tank, the culprit is often scum or dirty probes. Foods and some cleaning products build-up on the walls of the grey-water tank, or toilet paper hangs on the black-water tank probes causing oversensitive readings.
One method for cleaning the black-water tank that has been shown to work in most cases is to fill the tank about 1/2 full and dump in 20 pounds of cubed ice and drive the R.V. for several miles. The action of the ice will usually clean the tank walls and probes. After the ice has melted, the tank is drained.


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